I've had zero problems with mine, and would absolutely recommend this light. I fiddled around with settings for a while, and then got some advice(sorry I forget if I read it, or saw a video). It's made for the refugium so I run it like this now, and I am extremely happy with it... On at 8pm, ramp up to 100% at 12am, run steady 100% until 4am, ramp down to 8 am. I run a display refugium so from 8 am to 8 PM I keep only the white and uv lights on at 5% each. Look at my previous posts compared to now for a visual on growth